NCP1203: PWM Controller, Fixed Frequency, Flyback, Current Mode

Housed in SO-8 or DIP8 package, the NCP1203 represents a major leap toward ultra-compact Switch-Mode Power Supplies and represents an excellent candidate to replace the UC384X devices.Thanks to its proprietary SmartMOS Very High Voltage Technology, the circuit allows the implementation of complete off-line AC/DC adapters, battery charger and a high-power SMPS with few external components.With an internal structure operating at a fixed 40 kHz, 60 kHz or 100 kHz switching frequency, the controller features a high-voltage start-up FET which ensures a clean and loss-less start up sequence. Its current-mode control naturally provides good audio susceptibility and inherent pulse-by-pulse control.When the current set point falls below a given value, e.g. the output power demand diminishes, the IC automatically enters the so-called skip cycle mode and provides improved efficiency at light loads while offering excellent performance in standby conditions. Because this occurs at a user adjustable low peak current, no acoustic noise takes place.The NCP1203 also includes an efficient protective circuitry which, in presence of an output over load condition, disables the output pulses while the device enters a safe burst mode, trying to restart. Once the default has gone, the device auto-recovers. Finally, atemperature shutdown with hysteresis helps building safe and robust power supplies.

Features
  • High-Voltage Start Up Current Source
  • Auto-Recovery Internal Output Short-Circuit Protection
  • Extremely Low No-Load Standby Power
  • Current-Mode with Adjustable Skip-Cycle Capability
  • Internal Leading Edge Blanking
  • 250 mA Peak Current Capability
  • Internally Fixed Frequency at 40 kHz, 61 kHz and 100 kHz
  • Direct Optocoupler Connection
  • Undervoltage Lockout at 7.6 V Typical
  • SPICE Models Available for TRANsient and AC Analysis
  • Pin to Pin Compatible with NCP1200
  • Pb-Free Packages are Available
Applications
  • AC/DC Adapters for Notebooks, etc.
  • Offline Battery Chargers
  • Auxiliary Power Supplies (USB, Appliances, TVs, etc.)
Design & Development Tools (3)
Document TitleDocument ID/SizeRevisionRevision Date
Flyback Current Mode Loop Compensation Design WorksheetFLYBACK DWS.XLS.ZIP (3516kB)10Dec, 2014
NCP1200 Design WorksheetNCP1200 DWS.XLS (225.0kB)0
NCP1200 Design Worksheet InstructionsEBNCP1200/D (23.0kB)0
Data Sheets (1)
Document TitleDocument ID/SizeRevisionRevision Date
PWM Controller, Fixed Frequency, Flyback, Current ModeNCP1203/D (251kB)12Apr, 2015
Application Notes (6)
Document TitleDocument ID/SizeRevisionRevision Date
A 70 W Low Standby Power Supply w/NCP120x SeriesAND8076/D (178.0kB)2
Conducted EMI Filter Design for the NCP1200AND8032/D (534.0kB)2
Offline Buck Converter with Tapped Inductor Improves PerformanceAND8318/D (100.0kB)1
Ramp Compensation for the NCP1200AND8029/D (128.0kB)1
Stability Analysis in Multiple Loop SystemsAND8327/D (213.0kB)0
Tips and Tricks to Build Efficient Circuits with NCP1200AND8069/D (139.0kB)1
Package Drawings (2)
Document TitleDocument ID/SizeRevision
8 LEAD PDIP626-05 (35.0kB)P
SOIC-8 Narrow Body751-07 (62.6kB)AK
Simulation Models (2)
Document TitleDocument ID/SizeRevisionRevision Date
NCP1203 simulation solution for IsSPICENCP1203I.ZIP (90.0kB)
NCP1203 simulation solution for ORCADNCP1203O.ZIP (39.0kB)
Order Information
ProductStatusCompliancePackageMSL*ContainerBudgetary Price/Unit
NCP1203D100R2GActivePb-free Halide freeSOIC-8751-071Tape and Reel2500$0.4093
NCP1203D40R2GActivePb-free Halide freeSOIC-8751-071Tape and Reel2500$0.4093
NCP1203D60R2GActivePb-free Halide freeSOIC-8751-071Tape and Reel2500$0.4093
NCP1203P100GActivePb-free Halide freePDIP-8626-05NATube50$0.4467
NCP1203P40GActivePb-free Halide freePDIP-8626-05NATube50$0.4467
NCP1203P60GActivePb-free Halide freePDIP-8626-05NATube50$0.4467
Specifications
ProductTopologyControl Modefsw Typ (kHz)Stand-by ModeUVLO (V)Short Circuit ProtectionLatchSoft StartVCC Max (V)Drive Cap. (mA)
NCP1203D100R2GFlybackCurrent Mode100YesYesYesNoNo16250
NCP1203D40R2GFlybackCurrent Mode40YesYesYesNoNo16250
NCP1203D60R2GFlybackCurrent Mode60YesYesYesNoNo16250
NCP1203P100GFlybackCurrent Mode100YesYesYesNoNo16250
NCP1203P40GFlybackCurrent Mode40YesYesYesNoNo16250
NCP1203P60GFlybackCurrent Mode60YesYesYesNoNo16250
PWM Controller, Fixed Frequency, Flyback, Current Mode (251kB) NCP1203
Flyback Current Mode Loop Compensation Design Worksheet NCP1129
NCP1200 Design Worksheet NCP1203
NCP1200 Design Worksheet Instructions NCP1203
A 70 W Low Standby Power Supply w/NCP120x Series MUR160
Conducted EMI Filter Design for the NCP1200 MBRS360P
Offline Buck Converter with Tapped Inductor Improves Performance NCP1055
Ramp Compensation for the NCP1200 MUR160
Stability Analysis in Multiple Loop Systems NCP1055
Tips and Tricks to Build Efficient Circuits with NCP1200 NCP1308
NCP1203 simulation solution for IsSPICE NCP1203
NCP1203 simulation solution for ORCAD NCP1203
SOIC-8 Narrow Body CM1216
8 LEAD PDIP NE592
NCP1203